<?php

    class PHPExcel_Reader_Excel5_Color_BuiltIn {
        protected static $map = [
            0x00 => '000000',
            0x01 => 'FFFFFF',
            0x02 => 'FF0000',
            0x03 => '00FF00',
            0x04 => '0000FF',
            0x05 => 'FFFF00',
            0x06 => 'FF00FF',
            0x07 => '00FFFF',
            0x40 => '000000',
            // system window text color
            0x41 => 'FFFFFF',
            // system window background color
        ];

        /**
         * Map built-in color to RGB value
         * @param int $color Indexed color
         * @return array
         */
        public static function lookup($color) {
            if (isset(self::$map[$color])) {
                return ['rgb' => self::$map[$color]];
            }
            return ['rgb' => '000000'];
        }
    }